10 Best Portable Greenhouse Heaters 2025 in the United States

The TRUSTECH Greenhouse Heater is a compact electric heater ideal for small indoor spaces like greenhouses, grow tents, garages, or patios up to about 160 square feet. It offers a decent heating capacity of 1500 watts with three modes: low heat (750W), high heat (1500W), and fan-only, allowing you to adjust warmth as needed. The digital thermostat with a waterproof sensor probe stands out by letting you precisely set temperatures from 40°F to 108°F, which helps maintain a stable environment for plants or comfort in a workspace.

Safety is well-covered with flame-retardant materials, overheat protection, and a reliable thermostat controller, so you can run it safely without constant supervision. Energy efficiency is supported through automatic thermostat regulation that switches the heater on and off to save power while keeping temperature steady, which is useful for reducing electricity bills. Portability is another strong point—the heater weighs just under 5 pounds, includes a sturdy handle, a non-slip base, and a long 7.5-foot power cord, making it easy to move and place where needed.

A minor downside is that it's designed primarily for indoor use and smaller spaces, so it might not be sufficient for larger greenhouses or outdoor areas. Also, being electric, it requires access to a power outlet, limiting where it can be used. This heater is well suited for gardeners or hobbyists looking for an easy-to-use, safe, and efficient way to maintain warmth in smaller indoor plant environments or personal spaces.

The Dr Infrared Heater DR-268 is a solid choice for those seeking a portable greenhouse heater. With its heating capacity of up to 1500W, it effectively warms areas of 150-200 square feet, making it suitable for greenhouses, garages, and sheds. One of its standout features is the built-in digital thermostat, which allows for precise temperature control, ensuring that your plants stay at the right temperature without wasting energy. User-friendly features like the digital display and selectable Auto or Manual modes also make operation straightforward, even for those who aren't tech-savvy.

Safety is a priority with this heater, as it includes features like overheat protection and is designed to be water-resistant (rated IPX5), allowing it to be used both indoors and outdoors without worrying about damage from moisture. Its construction from dual layers of aluminum helps retain heat effectively, making it especially useful in colder environments.

There are some considerations to keep in mind. The heater requires assembly and, while it has multiple mounting options, it may not be as easy to reposition once installed. Additionally, while it’s energy efficient, being electric means it will add to your electricity bill, especially with continuous use. Lastly, with a one-year limited warranty and USA-based customer support, users can feel secure about their purchase. This heater is particularly suited for gardeners and growers looking for a reliable, versatile heating solution that can easily adapt to different spaces and conditions.

The Buyplus Greenhouse Heater is a solid choice if you need a reliable way to keep your plants cozy in a small to medium greenhouse or similar outdoor spaces up to about 215 square feet. With 1500 watts of power, it heats up very quickly—within 3 seconds—so you won’t have to wait long to enjoy warmth. The digital thermostat is a big help, letting you set and maintain a precise temperature between 40℉ and 108℉, which is ideal for protecting delicate plants from cold spells. Safety is well-covered thanks to built-in overheat protection that automatically shuts off the heater if it gets too hot, giving extra peace of mind. You also get two modes: a low-power fan-only option and full heating mode, which adds versatility across different seasons.

The heater is designed for easy portability with a handle and a long 7.5 ft cord. Its adjustable angle and stable base make it convenient to position exactly where you need it. Since it's electric, it’s clean and energy-efficient compared to fuel-based heaters, but you do need access to an outlet. On the downside, the 215 sq.ft. coverage means it’s best for smaller spaces; larger greenhouses may require multiple units or a different heater type. Also, while the fast heating is great, the unit’s 9-pound weight might be a bit heavy if you plan on moving it frequently.

This heater effectively balances power, safety, and user-friendly features, making it suitable for plant enthusiasts who want dependable warmth in their greenhouses or similar outdoor areas.